US8509176B2 - Method for transmitting and receiving data in a wireless communication system - Google Patents

Method for transmitting and receiving data in a wireless communication system Download PDF

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Publication number
US8509176B2
US8509176B2 US13/264,372 US201013264372A US8509176B2 US 8509176 B2 US8509176 B2 US 8509176B2 US 201013264372 A US201013264372 A US 201013264372A US 8509176 B2 US8509176 B2 US 8509176B2
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Prior art keywords
frame
zone
wireless communication
offset
communication system
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Expired - Fee Related
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US13/264,372
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US20120093080A1 (en
Inventor
Wook Bong Lee
Han Gyu Cho
Sung Ho Moon
Jin Sam Kwak
Bin Chul Ihm
Min Seok Noh
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LG Electronics Inc
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LG Electronics Inc
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Assigned to LG ELECTRONICS INC. reassignment LG ELECTRONICS INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHO, HAN GYU, IHM, BIN CHUL, KWAK, JIN SAM, LEE, WOOK BONG, MOON, SUNG HO, NOH, MIN SEOK
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/02—Hybrid access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
    • H04B7/2656—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA] for structure of frame, burst
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H04W88/10—Access point devices adapted for operation in multiple networks, e.g. multi-mode access points

Definitions

  • the present invention relates to a wireless communication system, and more particularly, to a method of transmitting and receiving data in a wireless communication system.
  • IEEE 802.16e terminals of the related art have already come into wide use at a point of time when the IEEE 802.16m system is commercially available. Accordingly, the IEEE 802.16m system needs to be standardized to be compatible with the IEEE 802.16e system.
  • the IEEE 802.16m system requires a frame structure capable of supporting an IEEE 802.16e terminal.
  • the frame of the IEEE 802.16m system includes a plurality of subframes.
  • a subframe includes a plurality of subcarriers on a frequency axis and includes a plurality of OFDM symbols on a time axis. Some of the plurality of subframes included in one frame are used for transmitting uplink data and the rest are used for transmitting downlink data.
  • the IEEE 802.16m system uses some downlink subframes for the IEEE 802.16m system and uses the rest of the downlink subframes for the IEEE 802.16e system.
  • a zone used for the IEEE 802.16e system is called a wireless metropolitan area network orthogonal frequency division multiple access downlink zone (hereinafter, referred to as “WirelessMAN OFDM DL zone”) and a zone used for the IEEE 802.16m system is called an Advanced Air Interface downlink zone (hereinafter, referred to as “Advanced Air Interface DL zone”).
  • a downlink frame structure with a bandwidth of 8.75 MHz of the IEEE 802.16m system according to the related art will be described with reference to FIGS. 1 and 2 .
  • FIG. 1 is a diagram showing a downlink frame structure according to the related art in the case where a frame offset is 1
  • FIG. 2 is a diagram showing a downlink frame structure according to the related art in the case where a frame offset is 2.
  • the frame offset defines an offset between a start point of a frame for an IEEE 802.16e system and a start point of a frame for an IEEE 802.16m system in the unit of subframes.
  • the frame offset is an integer equal to or greater than 1 and less than the number of downlink subframes. For example, if one frame includes five downlink subframes, the frame offset is an integer equal to or greater than 1 and less than 5.
  • the subframes for the IEEE 802.16m system may be divided into four types.
  • a type 1 subframe includes six OFDM symbols
  • a type 2 subframe includes seven OFDM symbols
  • a type 3 subframe includes five OFDM symbols
  • a type 4 subframe includes nine OFDM symbols.
  • the WirelessMAN OFDMA DL zone includes a type 1 subframe. That is, the WirelessMAN OFDMA DL zone includes six OFDM symbols in FIG. 1 and the WirelessMAN OFDMA DL zone includes 12 OFDM symbols in FIG. 2 .
  • a preamble is allocated to a first OFDM symbol of the frame for the IEEE 802.16e system and a FCH and a DL-MAP are allocated to second and third OFDM symbols.
  • a subchannelization method of the IEEE 802.16e system includes partial usage of subchannel (hereinafter, referred to as “PUSC”), full usage of subchannel (hereinafter, referred to as “FUSC”) and adaptive modulation and coding (hereinafter, referred to as “AMC”).
  • the PUSC includes two OFDM symbols
  • the FUSC includes one OFDM symbol
  • the AMC includes three OFDM symbols.
  • the second and third OFDM symbols, to which the FCH and the DL-MAP are allocated, are subchannelized by the PUSC.
  • odd OFDM symbols are present in a portion excluding portions, to which the preamble, the FCH and the DL-MAP are allocated, in the WirelessMAN OFDMA DL zone.
  • the present invention is directed to a method of transmitting and receiving data in a wireless communication system that substantially obviates one or more problems due to limitations and disadvantages of the related art.
  • An object of the present invention is to provide a method of transmitting data using a frame structure able to improve efficiency of a wireless communication system.
  • Another object of the present invention is to provide a method of transmitting data, which is capable of reducing overhead and efficiently utilizing radio resources.
  • a method of transmitting data in a wireless communication system includes, at a base station, transmitting downlink data to a first terminal supporting a first system through a first zone of a frame; and transmitting downlink data to a second terminal supporting a second system through a second zone, wherein the second zone is located behind the first zone by a frame offset on a time axis, wherein the wireless communication system supports a bandwidth of 8.75 MHz, the frame offset is an offset between a start point of a frame for the first system and a start point of a frame for the second system, and the first zone includes 3+6*(frame offset ⁇ 1) Orthogonal Frequency Division Multiplexing (OFDM) symbols.
  • OFDM Orthogonal Frequency Division Multiplexing
  • a method of receiving data in a wireless communication system includes, at a terminal, receiving downlink data through a second zone of a frame, wherein the second zone is located behind a first zone by a frame offset, wherein the first zone is used for transmitting downlink data to another terminal supporting a system different from a system supported by the terminal, wherein the wireless communication system supports a bandwidth of 8.75 MHz, the first zone includes 3+6*(frame offset ⁇ 1) Orthogonal Frequency Division Multiplexing (OFDM) symbols, and the frame offset is an offset between a start point of a frame for the first system and a start point of a frame for the second system.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the wireless communication system may support a type 1 subframe including six OFDM symbols and a type 2 subframe including three OFDM symbols.
  • All subframes included in the second zone may be type 1 subframes.
  • a second zone includes only a type 1 subframe, a physical layer structure of the related art may be utilized.
  • FIG. 1 is a diagram showing a downlink frame structure according to the related art in the case where a frame offset is 1;
  • FIG. 2 is a diagram showing a downlink frame structure according to the related art in the case where a frame offset is 2;
  • FIG. 3 is a diagram showing a frame structure of a Time Division Duplexing (TDD) wireless communication system with a bandwidth of 8.75 MHz and a Cyclic Prefix (CP) which is 1 ⁇ 8 of an available symbol time;
  • TDD Time Division Duplexing
  • CP Cyclic Prefix
  • FIG. 4 is a diagram showing a frame structure according to a first embodiment of the present invention in the case where a frame offset is 1;
  • FIG. 5 is a diagram showing a frame structure according to the first embodiment of the present invention in the case where a frame offset is 2;
  • FIG. 6 is a diagram showing a frame structure according to the first embodiment of the present invention in the case where a frame offset is 3;
  • FIG. 7 is a diagram showing a downlink frame structure according to a second embodiment of the present invention in the case where a frame offset is 1;
  • FIG. 8 is a diagram showing a downlink frame structure according to the second embodiment of the present invention if a type 1 subframe is included in a second zone;
  • FIG. 9 is a diagram showing a downlink frame structure according to a third embodiment of the present invention in the case where a frame offset is 1;
  • FIG. 10 is a diagram showing a downlink frame structure according to the third embodiment of the present invention in the case where a frame offset is 2.
  • FIG. 3 is a diagram showing a frame structure of a TDD wireless communication system with a bandwidth of 8.75 MHz and a CP which is 1 ⁇ 8 of an available symbol time.
  • a superframe includes four frames and each frame includes seven subframes.
  • the superframe includes a superframe header (SFH).
  • SFH superframe header
  • the subframe includes a plurality of subcarriers on a frequency axis and a plurality of OFDM symbols on a time axis.
  • the subframes may be divided into four types according to the number of OFDM symbols included in the subframe.
  • a type 1 subframe includes six OFDM symbols
  • a type 2 subframe includes seven OFDM symbols
  • a type 3 subframe includes five OFDM symbols
  • a type 4 subframe includes nine OFDM symbols. Referring to FIG. 3 , three of six subframes are type 1 subframes and the rest are type 3 subframes.
  • FIG. 3 shows the frame structure for the TDD case.
  • the TDD frame is obtained by dividing a frame into a zone for downlink transmission and a zone for uplink transmission on a time axis. That is, some of a plurality of subframes included in the frame are used for downlink transmission and the rest are used for uplink transmission.
  • the number of subframes used for downlink transmission and the number of subframes used for uplink transmission are determined according to a ratio of downlink to uplink subframes. For example, as shown in FIG. 3 , five front subframes of seven subframes included in one frame may be used for downlink transmission and two rear subframes may be used for uplink transmission.
  • a switching time is present between a downlink subframe and an uplink subframe.
  • the present invention relates to a method of transmitting downlink data to a terminal supporting a first system and a terminal supporting a second system through a frame in which a portion for uplink transmission and a portion for downlink transmission are subjected to TDD.
  • FIG. 3 shows a frame structure in the case where a base station of a wireless communication system supports one system when a bandwidth is 8.75 MHz.
  • the wireless communication system needs to support a new system as well as the existing system. Accordingly, in the embodiment of the present invention, a frame structure in the case where a wireless communication system supports the new system as well as the existing system when the bandwidth is 8.75 MHz is proposed.
  • the base station divides a plurality of downlink subframes included in a frame into a first zone and a second zone, transmits a downlink signal to a terminal supporting a first system through the first zone, and transmits a downlink signal to a terminal for a second system through the second zone.
  • a downlink frame structure according to the first embodiment of the present invention will be described with reference to FIGS. 4 to 6 .
  • FIG. 4 is a diagram showing a frame structure according to the first embodiment of the present invention in the case where a frame offset is 1
  • FIG. 5 is a diagram showing a frame structure according to the first embodiment of the present invention in the case where a frame offset is 2
  • FIG. 6 is a diagram showing a frame structure according to the first embodiment of the present invention in the case where a frame offset is 3.
  • the frame offset is an offset between a start point of a frame for the first system and a start point of a frame for the second system.
  • a horizontal axis denotes time
  • p denotes a preamble of the first system
  • PUSC denotes a symbol subchannelized by PUSC.
  • the first zone is a zone for communicating with a terminal supporting the first system and the second zone is a zone for communicating with a terminal for the second system.
  • the frame for the first system starts from a first OFDM symbol of the first zone and the frame for the second system starts from a first OFDM symbol of the second zone.
  • FIGS. 4 to 6 show the downlink frame when the ratio of the downlink to uplink subframes is 5:2, the present invention is not limited thereto.
  • the downlink subframe includes 27 OFDM symbols.
  • the downlink subframe according to the first embodiment of the present invention includes a mini-subframe including three OFDM symbols, for time alignment with an IEEE 802.16e system.
  • the use of a subframe including three OFDM symbols as a first subframe of a downlink frame maintains Transmission Time Interval (TTI) transmission of the unit of type 1 subframes of the IEEE 802.16m system by using front subframes of the downlink frame for the IEEE 802.16e system and using subframes including six rear OFDM symbols for the IEEE 802.16m system, if a terminal operating in an IEEE 802.16e system mode and a terminal operating in an IEEE 802.16m system mode are mixed.
  • TTI Transmission Time Interval
  • the first zone includes 3+6*(frame offset ⁇ 1) OFDM symbols. That is, the first zone includes three OFDM symbols in FIG. 4 , the second zone includes nine OFDM symbols in FIG. 5 , and the second zone includes 15 OFDM symbols in FIG. 6 .
  • the first zone includes a mini-subframe at a foremost portion. If the frame offset is 1, as shown in FIG. 4 , the first zone includes one mini-subframe. If the frame offset is 2, as shown in FIG. 5 , the first zone includes one mini-subframe and one type 1 subframe. Whenever the frame offset is increased one by one, the number of type 1 subframes included in the first zone is increased one by one. That is, the frame offset includes the mini-subframe and may further include the type 1 subframe.
  • All the subframes included in the second zone are type 1 subframes.
  • FIG. 7 is a diagram showing a frame structure according to the second embodiment of the present invention in the case where a frame offset is 1.
  • a downlink frame includes 27 OFDM symbols.
  • the downlink frame according to the second embodiment of the present invention includes three type 2 subframes and one type 1 subframe.
  • All the subframes included in the second zone are type 2 subframes and the first zone includes 6+7*(frame offset ⁇ 1) OFDM symbols.
  • FIG. 8 is a diagram showing a downlink frame structure according to the second embodiment of the present invention if a type 1 subframe is included in a second zone.
  • the downlink frame according to the second embodiment of the present invention includes three type 2 subframes and one type 1 subframe, and the first zone includes 7*(frame offset) OFDM symbols.
  • FIG. 9 is a diagram showing a downlink frame structure according to the third embodiment of the present invention in the case where a frame offset is 1
  • FIG. 10 is a diagram showing a downlink frame structure according to the third embodiment of the present invention in the case where a frame offset is 2.
  • the downlink frame according to the third embodiment of the present invention includes 27 OFDM symbols and the downlink frame includes three type 3 subframes and two type 1 subframes.
  • Both type 1 subframes may be included in the second zone as shown in FIG. 9 or one type 1 subframe may be included in the first zone and the other type 1 subframe may be included in the second zone as shown in FIG. 10 .
  • the first zone includes 5*(frame offset) OFDM symbols in FIG. 9 and the first zone includes 6+5*(frame offset ⁇ 1) OFDM symbols in FIG. 10 .
  • the embodiments of the present invention can be implemented by a variety of means, for example, hardware, firmware, software, or a combination thereof.
  • the method of transmitting and receiving the data according to the embodiment of the present invention can be implemented with application specific integrated circuits (ASICs), Digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), a processor, a controller, a microcontroller, a microprocessor, etc.
  • ASICs application specific integrated circuits
  • DSPs Digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs field programmable gate arrays
  • the present invention can be implemented in the form of a variety of formats, for example, modules, procedures, functions, etc.
  • the software codes may be stored in a memory unit so that it can be driven by a processor.
  • the memory unit is located inside or outside of the processor, so that it can communicate with the aforementioned processor via a variety of well-known parts.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Mobile Radio Communication Systems (AREA)
US13/264,372 2009-04-14 2010-04-12 Method for transmitting and receiving data in a wireless communication system Expired - Fee Related US8509176B2 (en)

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US16930409P 2009-04-14 2009-04-14
KR10-2009-0067777 2009-07-24
KR1020090067777A KR101498067B1 (ko) 2009-04-14 2009-07-24 무선 통신 시스템에서 데이터 전송 및 수신 방법
KR1020090067777 2009-07-24
US13/264,372 US8509176B2 (en) 2009-04-14 2010-04-12 Method for transmitting and receiving data in a wireless communication system
PCT/KR2010/002237 WO2010120076A2 (ko) 2009-04-14 2010-04-12 무선 통신 시스템에서 데이터 전송 및 수신 방법

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KR101498067B1 (ko) 2015-03-03
WO2010120076A2 (ko) 2010-10-21
KR20100113961A (ko) 2010-10-22
WO2010120076A3 (ko) 2011-01-27
CN102396168A (zh) 2012-03-28
CN102396168B (zh) 2014-10-29
RU2011140986A (ru) 2013-05-20
US20120093080A1 (en) 2012-04-19
RU2528167C2 (ru) 2014-09-10

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